21u^2-46u-7=0

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Solution for 21u^2-46u-7=0 equation:


Simplifying
21u2 + -46u + -7 = 0

Reorder the terms:
-7 + -46u + 21u2 = 0

Solving
-7 + -46u + 21u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-1 + -7u)(7 + -3u) = 0

Subproblem 1

Set the factor '(-1 + -7u)' equal to zero and attempt to solve: Simplifying -1 + -7u = 0 Solving -1 + -7u = 0 Move all terms containing u to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -7u = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -7u = 0 + 1 -7u = 0 + 1 Combine like terms: 0 + 1 = 1 -7u = 1 Divide each side by '-7'. u = -0.1428571429 Simplifying u = -0.1428571429

Subproblem 2

Set the factor '(7 + -3u)' equal to zero and attempt to solve: Simplifying 7 + -3u = 0 Solving 7 + -3u = 0 Move all terms containing u to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -3u = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -3u = 0 + -7 -3u = 0 + -7 Combine like terms: 0 + -7 = -7 -3u = -7 Divide each side by '-3'. u = 2.333333333 Simplifying u = 2.333333333

Solution

u = {-0.1428571429, 2.333333333}

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